00858nas a22003374a 4500001000800000003001100008005001700019008004100036037005700077040002600134041000800160044000800168245001900176260004900195300002300244310001000267362003600277650002700313655001300340710006100353866000900414866000900423866000900432866001200441866000900453866001200462866001200474866000900486866001200495866001300507GMR-039AR-SsjUBGM20251222151447.0251021k19631993xxuar g 000 0 eng d bPO BOX 7727 Austin. Texas 78713-9826. Estados Unidos bspacAR-SsjUBGMeaacr aeng axxu00aAnnual Report. aAustin :bBureau of Economic Geology,c1963- av. :bil. ;c28 cm aAnual1 aEn biblioteca años 1963-1993. 4aGeología económica 4aMemorias2 aUniversity of Texas.bBureau of Economic Geologyeeditor 0a1963 0a1966 0a1968 0a1970-71 0a1973 0a1975-80 0a1982-83 0a1985 0a1987-91 0a1992-93-